CVE-2024-26621 (GCVE-0-2024-26621)
Vulnerability from cvelistv5 – Published: 2024-03-02 21:31 – Updated: 2026-08-05 11:26
VLAI
EPSS
VEX
Title
mm: huge_memory: don't force huge page alignment on 32 bit
Summary
In the Linux kernel, the following vulnerability has been resolved:
mm: huge_memory: don't force huge page alignment on 32 bit
commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP
boundaries") caused two issues [1] [2] reported on 32 bit system or compat
userspace.
It doesn't make too much sense to force huge page alignment on 32 bit
system due to the constrained virtual address space.
[1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/
[2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:56 UTC
Assigner
References
27 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1854bc6e2420472676c5c90d3d6b15f6cd640e40 , < 87632bc9ecff5ded93433bc0fca428019bdd1cfe
(git)
Affected: 1854bc6e2420472676c5c90d3d6b15f6cd640e40 , < 6ea9aa8d97e6563676094cb35755884173269555 (git) Affected: 1854bc6e2420472676c5c90d3d6b15f6cd640e40 , < 7432376c913381c5f24d373a87ff629bbde94b47 (git) Affected: 1854bc6e2420472676c5c90d3d6b15f6cd640e40 , < 4ef9ad19e17676b9ef071309bc62020e2373705d (git) |
guessed | |
| Linux | Linux |
Affected:
5.18
Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.81 , ≤ 6.1.* (semver) Unaffected: 6.6.46 , ≤ 6.6.* (semver) Unaffected: 6.7.6 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix) |
guessed |
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.7.6",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8",
"versionStartIncluding": "5.18",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: huge_memory: don\u0027t force huge page alignment on 32 bit\n\ncommit efa7df3e3bb5 (\"mm: align larger anonymous mappings on THP\nboundaries\") caused two issues [1] [2] reported on 32 bit system or compat\nuserspace.\n\nIt doesn\u0027t make too much sense to force huge page alignment on 32 bit\nsystem due to the constrained virtual address space.\n\n[1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/\n[2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The flaw\u0027s effect \u2014 a fully predictable memory layout for every process, including internet-facing daemons such as sshd on 32-bit/compat systems \u2014 is usable by an entirely remote, unauthenticated attacker who never needs any access to the host; this is the exact condition Qualys leveraged for regreSSHion, and the CVE\u0027s own reference set is the oss-security thread on that remote impact.\nAC:L - On 32-bit and compat processes the outcome is fully deterministic, not probabilistic \u2014 libc lands at a fixed address (e.g. 0xf7c00000) on every single run, so nothing about exploitation depends on conditions outside the attacker\u0027s control.\nPR:N - No credentials, account, or local foothold is required; the library and heap base addresses are constants that can be computed offline from the same distro or firmware image, and they are identical for privileged root daemons and unprivileged processes alike.\nUI:N - The kernel applies the 2 MB alignment unconditionally on every mmap of a \u22652 MB file or anonymous mapping; no victim action is needed for the layout to become predictable.\nS:U - The kernel is the security authority governing process address-space layout, and the lost randomization affects resources it already manages; no sandbox, VM, or IOMMU boundary is crossed.\nC:H - This is a complete, permanent disclosure of the exact secret ASLR exists to protect \u2014 on 32-bit all 8 bits of mmap entropy are annihilated, exposing the full mapping layout of every process on the system rather than a bounded few-byte leak.\nI:N - Defeating address randomization does not by itself write to or modify any kernel or userspace data; integrity compromise only arises when a separate memory-corruption bug is chained in.\nA:L - The len+PMD_SIZE padding and inter-VMA alignment holes exhaust the constrained 32-bit virtual address space, producing documented mmap2() ENOMEM failures and consequent userspace tool crashes (pahole), plus max_map_count exhaustion \u2014 degradation rather than a kernel panic or hang."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:26:19.370Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/87632bc9ecff5ded93433bc0fca428019bdd1cfe"
},
{
"url": "https://git.kernel.org/stable/c/6ea9aa8d97e6563676094cb35755884173269555"
},
{
"url": "https://git.kernel.org/stable/c/7432376c913381c5f24d373a87ff629bbde94b47"
},
{
"url": "https://git.kernel.org/stable/c/4ef9ad19e17676b9ef071309bc62020e2373705d"
}
],
"title": "mm: huge_memory: don\u0027t force huge page alignment on 32 bit",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-26621",
"datePublished": "2024-03-02T21:31:49.158Z",
"dateReserved": "2024-02-19T14:20:24.134Z",
"dateUpdated": "2026-08-05T11:26:19.370Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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